Taylor bubble formation and flowing in a straight millimetric channel with a cross-junction inlet geometry Part II: Gas-liquid mass transfer
نویسندگان
چکیده
• Mass transfer was studied during bubble formation at a cross-junction. Accuracy of resazurin-based technique improved by advanced image systems. Different mechanisms were observed for the developing O 2 concentration fields. Oxygen fields measured and after pinch-off. A scaling law relating k L f c proposed to gather literature data. Using colorimetric acquisition, equivalent oxygen inside liquid slugs stage cross-junction in straight millimetric channel. Firstly, two different identified development depending on two-phase Reynolds numbers (Re TP ). Under low Re , jet-like central ‘finger’ occurred between newly formed gas finger pinch-off point. Right pinch-off, dissolved transported first entering from side inlets, later recirculation loop slug. higher highly concentrated spots near rear channel wall region, much more complex flow structure slug appeared. Then, whatever operating conditions, it that averaged concentrations followed nearly linear relation as function axial position channel, related mass flux density decreased far bubbles flowed along channel’s length. The process could be decomposed into three stages when considering temporal evolution cumulated At last, overall volumetric coefficients ( ) deduced fields, found linearly increase with frequencies, leading law.
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ژورنال
عنوان ژورنال: Chemical Engineering Science
سال: 2022
ISSN: ['1873-4405', '0009-2509']
DOI: https://doi.org/10.1016/j.ces.2022.117752